Diamondback Firearms OEM Replacement Barrel FN Herstal M16 5.56x45mm NATO 16in Medium/M4 Profile Carbine-Length 1-8 Twist 1/2 x 28 Thread 4150 CrMov. 56x45mm NATO 16" Black - Specifications for Diamondback Firearms OEM Replacement FN Herstal M16 Barrel: Manufacturer: Diamondback Firearms Color: Black Nitride Finish: Nitride Caliber: 5.56x45mm NATO Barrel Length: 16 in Barrel Profile: Medium M4 Gas System Length: Carbine Length Threads per Inch: 1/2x28 Barrel Twist Rate: 1-8 Barrel Material: 4150 CMV Steel Gun Make: FN Herstal Gun Model: M16 Weight: 1.8 lb Length: 16 in Diamondback 556C16MF50B8R OEM Replacement (M4 Contour) 5.56x45mm NATO 16" Black What firearm models does the manufacturer say Diamondback Firearms OEM Replacement FN Herstal M16 Barrel is compatible with? The manufacturer suggests that Diamondback Firearms OEM Replacement FN Herstal M16 Barrel is compatible with M16Diamondback Firearms 556C16MF50B8R: OEM Replacement Barrel FN Herstal M16 5.56x45mm NATO 16in Medium/M4 Profile Carbine-Length 1-8 Twist 1/2 x 28 Thread 4150 CrMov Black Nitride